The Celica Supra was built on a Lotus Frame (Lotus designed the Frame and Suspension, while toyota did the engine, transmisssion, exhaust, and body) and is both longer and wider than the AE86 Trueno. In fact, this a completely different car.
If anyone take interest, tell me and I'll go outside and snap some pics of mine for you.
Also note, there was no 1992 Celica Supra, after 1986 (1986.5 to be exact) the Celica and the Supra became their own separate cars. Don't get me wrong, and MKIII Twin Turbo would be awesome, but I want this one over it.
heres some cool infor about the engine specs.
http://en.wikipedia.org/wiki/Toyota_M_engine
Once again, sorry for rambleing. Just trying to say that the Sprinter Trueno and the Celica Supra are two completely different cars. Later guys.